var b64pad = ''
var chrsz = 8
function b64_md5(s) { return binl2b64(core_md5(str2binl(s), s.length * chrsz)) }

function core_md5(x, len) {
    x[len >> 5] |= 0x80 << ((len) % 32)
    x[(((len + 64) >>> 9) << 4) + 14] = len
    var a = 1732584193
    var b = -271733879
    var c = -1732584194
    var d = 271733878
    for (var i = 0; i < x.length; i += 16) {
        var olda = a
        var oldb = b
        var oldc = c
        var oldd = d

        a = md5_ff(a, b, c, d, x[i + 0], 7, -680876936)
        d = md5_ff(d, a, b, c, x[i + 1], 12, -389564586)
        c = md5_ff(c, d, a, b, x[i + 2], 17, 606105819)
        b = md5_ff(b, c, d, a, x[i + 3], 22, -1044525330)
        a = md5_ff(a, b, c, d, x[i + 4], 7, -176418897)
        d = md5_ff(d, a, b, c, x[i + 5], 12, 1200080426)
        c = md5_ff(c, d, a, b, x[i + 6], 17, -1473231341)
        b = md5_ff(b, c, d, a, x[i + 7], 22, -45705983)
        a = md5_ff(a, b, c, d, x[i + 8], 7, 1770035416)
        d = md5_ff(d, a, b, c, x[i + 9], 12, -1958414417)
        c = md5_ff(c, d, a, b, x[i + 10], 17, -42063)
        b = md5_ff(b, c, d, a, x[i + 11], 22, -1990404162)
        a = md5_ff(a, b, c, d, x[i + 12], 7, 1804603682)
        d = md5_ff(d, a, b, c, x[i + 13], 12, -40341101)
        c = md5_ff(c, d, a, b, x[i + 14], 17, -1502002290)
        b = md5_ff(b, c, d, a, x[i + 15], 22, 1236535329)
        a = md5_gg(a, b, c, d, x[i + 1], 5, -165796510)
        d = md5_gg(d, a, b, c, x[i + 6], 9, -1069501632)
        c = md5_gg(c, d, a, b, x[i + 11], 14, 643717713)
        b = md5_gg(b, c, d, a, x[i + 0], 20, -373897302)
        a = md5_gg(a, b, c, d, x[i + 5], 5, -701558691)
        d = md5_gg(d, a, b, c, x[i + 10], 9, 38016083)
        c = md5_gg(c, d, a, b, x[i + 15], 14, -660478335)
        b = md5_gg(b, c, d, a, x[i + 4], 20, -405537848)
        a = md5_gg(a, b, c, d, x[i + 9], 5, 568446438)
        d = md5_gg(d, a, b, c, x[i + 14], 9, -1019803690)
        c = md5_gg(c, d, a, b, x[i + 3], 14, -187363961)
        b = md5_gg(b, c, d, a, x[i + 8], 20, 1163531501)
        a = md5_gg(a, b, c, d, x[i + 13], 5, -1444681467)
        d = md5_gg(d, a, b, c, x[i + 2], 9, -51403784)
        c = md5_gg(c, d, a, b, x[i + 7], 14, 1735328473)
        b = md5_gg(b, c, d, a, x[i + 12], 20, -1926607734)
        a = md5_hh(a, b, c, d, x[i + 5], 4, -378558)
        d = md5_hh(d, a, b, c, x[i + 8], 11, -2022574463)
        c = md5_hh(c, d, a, b, x[i + 11], 16, 1839030562)
        b = md5_hh(b, c, d, a, x[i + 14], 23, -35309556)
        a = md5_hh(a, b, c, d, x[i + 1], 4, -1530992060)
        d = md5_hh(d, a, b, c, x[i + 4], 11, 1272893353)
        c = md5_hh(c, d, a, b, x[i + 7], 16, -155497632)
        b = md5_hh(b, c, d, a, x[i + 10], 23, -1094730640)
        a = md5_hh(a, b, c, d, x[i + 13], 4, 681279174)
        d = md5_hh(d, a, b, c, x[i + 0], 11, -358537222)
        c = md5_hh(c, d, a, b, x[i + 3], 16, -722521979)
        b = md5_hh(b, c, d, a, x[i + 6], 23, 76029189)
        a = md5_hh(a, b, c, d, x[i + 9], 4, -640364487)
        d = md5_hh(d, a, b, c, x[i + 12], 11, -421815835)
        c = md5_hh(c, d, a, b, x[i + 15], 16, 530742520)
        b = md5_hh(b, c, d, a, x[i + 2], 23, -995338651)
        a = md5_ii(a, b, c, d, x[i + 0], 6, -198630844)
        d = md5_ii(d, a, b, c, x[i + 7], 10, 1126891415)
        c = md5_ii(c, d, a, b, x[i + 14], 15, -1416354905)
        b = md5_ii(b, c, d, a, x[i + 5], 21, -57434055)
        a = md5_ii(a, b, c, d, x[i + 12], 6, 1700485571)
        d = md5_ii(d, a, b, c, x[i + 3], 10, -1894986606)
        c = md5_ii(c, d, a, b, x[i + 10], 15, -1051523)
        b = md5_ii(b, c, d, a, x[i + 1], 21, -2054922799)
        a = md5_ii(a, b, c, d, x[i + 8], 6, 1873313359)
        d = md5_ii(d, a, b, c, x[i + 15], 10, -30611744)
        c = md5_ii(c, d, a, b, x[i + 6], 15, -1560198380)
        b = md5_ii(b, c, d, a, x[i + 13], 21, 1309151649)
        a = md5_ii(a, b, c, d, x[i + 4], 6, -145523070)
        d = md5_ii(d, a, b, c, x[i + 11], 10, -1120210379)
        c = md5_ii(c, d, a, b, x[i + 2], 15, 718787259)
        b = md5_ii(b, c, d, a, x[i + 9], 21, -343485551)

        a = safe_add(a, olda)
        b = safe_add(b, oldb)
        c = safe_add(c, oldc)
        d = safe_add(d, oldd)
    }
    return [a, b, c, d]
}

function md5_cmn(q, a, b, x, s, t) {
    return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}
function md5_ff(a, b, c, d, x, s, t) {
    return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
function md5_gg(a, b, c, d, x, s, t) {
    return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
function md5_hh(a, b, c, d, x, s, t) {
    return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}
function md5_ii(a, b, c, d, x, s, t) {
    return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
}

function safe_add(x, y) {
    var lsw = (x & 0xFFFF) + (y & 0xFFFF)
    var msw = (x >> 16) + (y >> 16) + (lsw >> 16)
    return (msw << 16) | (lsw & 0xFFFF)
}

function bit_rol(num, cnt) {
    return (num << cnt) | (num >>> (32 - cnt))
}

function str2binl(str) {
    var bin = []
    var mask = (1 << chrsz) - 1
    for (var i = 0; i < str.length * chrsz; i += chrsz) { bin[i >> 5] |= (str.charCodeAt(i / chrsz) & mask) << (i % 32) }
    return bin
}

function binl2b64(binarray) {
    var tab = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
    var str = ''
    for (var i = 0; i < binarray.length * 4; i += 3) {
        var triplet = (((binarray[i >> 2] >> 8 * (i % 4)) & 0xFF) << 16) |
      (((binarray[i + 1 >> 2] >> 8 * ((i + 1) % 4)) & 0xFF) << 8) |
      ((binarray[i + 2 >> 2] >> 8 * ((i + 2) % 4)) & 0xFF)
        for (var j = 0; j < 4; j++) {
            if (i * 8 + j * 6 > binarray.length * 32) { str += b64pad } else { str += tab.charAt((triplet >> 6 * (3 - j)) & 0x3F) }
        }
    }
    return str
}

export {
    b64_md5
}
